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A = - 3 x - 21

B = 8 x - 12

C = 11 x + 55

D = 2 x²  + 9 x

E = - 18 x - 12 x²

F = - 20 x + 10 x²

= - 3 x - 21

= 8 x - 12  

= 11 x + 55  

= 2 x²  + 9 x  

= - 18 x - 12 x²

= - 20 x + 10 x²